$5B + $725M Cambridge Analytica — 87 Million Profiles

A personality-quiz app harvested data from up to 87 million Facebook profiles — most of them friends of the ~305,000 who took the quiz — via Facebook's Open Graph platform. Cambridge Analytica used it to psychologically profile and target US voters in the 2016 campaign. Whistleblower Christopher Wylie exposed it in 2018. The FTC fined Facebook $5 billion (its largest-ever penalty), the SEC added $100M, and Meta later paid $725M to settle a class action.